Grate-bar for chain-grate stokers.



B. .l. MORRISON.

GRATE BAR FOR CHAIN GRATE STOKERS.

APPLICATION FILE D MAR. 10, I914.

INI EIVTOR Patented July 13, 1915.

3 SHEETS-SHEET 1. A

WITNESSES:

B. J. MORRISON.

GRATE BAR FOR CHAIN QRATE STOKERS.

I APPLICATION FILED MAR. I0, 1914. 1,146,1 Patented July 13, 1915;

3 SHEETS-SHEET 2.

R w W W B. J. MORRISON.

GRATE BAR FOR CHAIN GRATE STOKERS.

APPLICATION FILED MAR. 10, 1914. 1,146,]. 98. Patented July 13, 1915.

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COLUMBIA PLANOHRAPH COHWASHINGTON. D. c.

BAnTHoLoMEw J. MORRISON, or" NEW YORK, n. Y., assrenon To EDWARD :e.

DUNHAM, on NEWYORK, N. Y.

Gianna-Ban non CHAIN-GRATE STOKERS.

Specification of Letters Patent.

Patented July 13, 1915.

Application filed. March 10, 1914. Serial No. 823,661..

ments in Grate-Bars for Chain-Grate Stokers, of which the following is a specification. 7 V

This invention relates to mechanical stokers, particularly of the chain grate type. It is often found necessary in a stoker of this character to remove one of the grate bars for the purpose of replacement or repair. To accomplish this, it has hitherto been found necessary to practically dismantle the entire grate. Also when one of the grate bars is burnt at one point, it has usually been necessary to throw the entire bar away.

The principal objects ofthe present invention are to avoid these diiiiculties and to this end I provide a sectional grate bar, the parts of which are normally coupled rigidly together, the coupling being readily accessible for detaching the sections, whereupon the latter are readily swung out without disturbing the chains or the other grate bars.

The various further objects and advantages will appear more fully from the following detailed description and the features of novelty in theconstruction and combina-;

tion of parts willbe clearly pointed out in the claims.

In the drawings illustrating this invention, Figure 1 is a sectional elevation of a chain grate stoker located in the fire box of a steam boiler, with the grate bars of the improved construction applied thereto. Fig. 2 is a detail elevation of a grate bar detached illustrated as engaging the links of the chain. Fig. 3 is a bottom view of the grate bar shown in Fig. 2, and Fig. 4: isa

section taken along line H of Fig. .72..

Fig. 5 illustrates a modified form in which the grate bar is made in three sections. Fig. 6 is a fragmental elevation, and Fig. 7 is a fragmental plan view of a further modified form in which the hook portions alone are detachable. Fig. 8 is a section taken along line 88 of Fig. 1, illustrating the manner in which the bars may be removed from the chains.

Referring in detail to Figs. 1, 2, 3, 4 and 8 of the drawings, the chain grate consists of a pair of endless chains 10, passing over the op posing sprocket wheels 11 and 12. Through these sprockets the chains are actuated to feed the coal forward, as will be readily understood by those skilled in the art.

Carried by the links of the chain are the grate bars, which according to my improved construction, are readily detachable individually without disturbing the chains or the other grate bars. Each grate bar is formed in two sections 18 and 1 1, each of which may be stiffened with the usual depending webs 15 and 16. The sections are locked or coupled rigidly together by a pin 17, which passes through. registering apertures in the ears 18, extending from the web 15, and an aperture in the body of the web portion 16, which is embraced by the ears 18. The latter form a fork in which the mating portion of the web 16 lodges and together therewith constitute three registering ears into which the pin or key 17 is driven which is viewed in the direction of the arrows in the section line 88 of Fig. 1. Referring to Figs. 1 and 8, it will be noted that the pin 17 may be readily reached and re-. moved by inserting a tool between the grate bar inv question and the adjacent grate bar and then the sections may be swung out as indicated. in dotted lines in Fig. 8. By reason of the hookedformation of the projections 19, this swinging action may be readily accomplished without disturbing the chains. To facilitate the swinging action the hook projections arepreferably formed with substantially arcuate outer surfaces 20.

' When a new grate bar is to be inserted, the

tions are united by locking pins 27 passing through registering ears formed upon the adjacent sections as in the other form described. The end sections are also formed with the upturned hook projections 29 which engage the vertical links in the chains 10.

In the further modified form illustrated in Figs. 6 and 7, the grate bar 33 has the detachable hook sections 34:, each of which is formed preferably with two upturned hook portions 39 engaging alternate links, as clearly indicated in Fig. 7. The detachable sections are preferably formed with the cars 38 which embrace the web 35 of the grate bar and are coupled thereto by locking pins or keys 37.

From the various embodiments of my invention, it will be clear that I have provided a sectional grate bar for chain grate stokers which may be readily inserted and removed from the chains without dismantling the chains or the other cooperating parts of the stoker. If one of the sections becomes burnt, it may be removed and replaced without necessitating the replacement of an entire grate bar. Thus, the facility of repairing the stoker is increased and the cost of maintenance considerably reduced.

Having thus described my invention, I claim as new and desire to secure by Letters Patent:

1. In a chain grate stoker, a grate bar comprising a plurality of sections detachably secured to each other, projections extending from the outer ends of the sections, said projections interlocking with the chains and serving as suspending means for the grate bar, and said sections when detached from each other while in their inverted position being adapted to be swung trans- ,versely of the chains out of engagement therewith.

2. In combination with a pair of traveling chains of a chain grate stoker, of a sectional grate bar having projections for engaging the vertical links of the chain, and means for uniting the sections to form a rigid bar, said sections when detached from each other being adapted to be swung transversely of the chains out of engagement therewith.

3. A grate bar for chain grate stokers consisting of a plurality of sections, means for locking the sections to each other and hooked projections at the outer ends of the sections for engaging the vertical links of the chains, said hooked projections being adapted to be swung transversely of the chains out of engagement therewith when the sections are unlocked.

4L. A grate bar for chain grate stokers consisting of a plurality of sections, means for locking the sections to each other and upturned hooked projections at the outer ends of the sections for engaging the vertical links of the chains, said hooked projections being adapted to be swung out of engagement with the chains when the sections are unlocked.

5. A. grate bar for chain grate stokers consisting of a plurality of sections, each section comprising a body portion, a web for supporting and stiffening the body, registering ears on the meeting ends of the web portions, a key passing through said ears to lock the sections together, and hooks formed on the outer ends of the grate sections for engaging the chains, the sections being adapted to swing out of engagement with the chains when the sections are unlocked from each other.

6. In combination with the driving sprocket and chains of a chain grate stoker, of a sectional grate bar comprising a body portion for supporting the fuel and astifiening web formed at the bottom of the body portion transverse thereto, hooked projections formed on the outer ends of the sections adapted to engage the chains, registering ears formed on the extremity of the web and the adjacent section, and a key passing through the ears for locking the sections together, said key being exposed for separating the sections when the bar passes over the driving sprocket.

Signed at New York city, in the county of New York, and State of New York, this 3rd day of March A. D. 1914:.

BARTHOLOMEW J. MORRISON.

Witnesses:

WM. I. COHEN, MINNm S. MILLER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

